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Q. Kelli weighs 405 N, and she is sitting on a playground swing that hangs 0.43 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. Assume that air resistance is negligible.
How fast is Kelli moving when the swing passes through its lowest position?
The velocity of the wave traveling on a string is higher if you increase the length of the string (keeping the kind of string, and the tension of the string, unchanged)
How many revolutions does wheel make throughout the time
what the electrostatic force acts on the proton.
When two tuning forks of 146Hz and 161Hz, respectively, are sounded simultaneously, how many beats per second are heard.
A professor's office door is 0.94 wide, 2.2 high, 4.0 thick; has the mass of 23, and pivots on frictionless hinges. A "door closer" is attached to door and top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5..
What are sunspots and how are they related to the Sun's magnetic field? Is the magnetic field stronger weaker in sunspots? How does the temperature in a sunspot relate to the temperature in the rest of the photosphere.
A ball is thrown directly downward with an initial speed of 8.50 m/s, from the height of 29.5 m. After what time interval does it strike the ground.
An 8m, 200 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and ladder makes a 50.0° angle with the ground. How far up the ladder can an 800 N person climb before the ladde..
Coherent light with wavelength 546 nm passes through two very narrow slits, and the interference pattern is observed on a screen the distance of 3.00 {rm m} from the slits. The first-order bright fringe is a distance of 4.86 {rm mm} from the center o..
A car of mass = 1400 travelling at 60.0 enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between the road and the car's tires. Use = 9.80 throughout this problem.
Estimate the gravitational force between the Sun and Venus. The mass of the Sun is 1.99×10^30 kg. The mass of Venus is 48.7×10^23 kg. The distance between them is 10.8×10^10 m.
Sunlight is used in a double-slit interference experiment. The fourth-order maximum for the wavelength of 470 nm occurs at an angle of θ = 90°. Thus, it is on the verge of being eliminated from the pattern since θ cannot exceed 90°.
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